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A kind of crystal material and its preparation method and application

A technology of crystal materials and reactions, applied in the direction of polycrystalline material growth, crystal growth, chemical instruments and methods, etc., can solve problems such as complex structures, and achieve the effect of simple preparation process, good combination of reflection and radiation comprehensive performance, and excellent performance

Active Publication Date: 2020-08-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of them have complex structures and rely on preparation techniques

Method used

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  • A kind of crystal material and its preparation method and application
  • A kind of crystal material and its preparation method and application
  • A kind of crystal material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] According to the molar ratio of 0.5:1, weigh 2.144g magnesium acetate tetrahydrate and 1.64g phosphorous acid solid powder, pour them into a beaker, dissolve with deionized water, add a magnetic stir bar to stir, and adjust the speed to 400 rpm After 15 minutes, add 5ml cyclohexylamine, cover with cling film and stir for 15 minutes to obtain a uniform emulsion, wherein the volume ratio of cyclohexylamine to emulsion is 1:12; the uniform emulsion The turbid liquid was put into the reaction kettle, and then the reaction kettle was placed in an oven, and the oven temperature was set to 140°C and the reaction time was 2000 minutes. After the reaction is complete, take it out, wash and filter, dry the sample on the filter paper at 80°C for 5 hours, and obtain a sample with uniform particle size after grinding.

[0033] The test result of the emissivity of the sample in the mid- and far-infrared band of 2.5-25 μm was 0.914, and the reflectivity of the 0.2-2.5 μm ultraviolet-visi...

Embodiment 2

[0038] Weigh 4.289g magnesium acetate tetrahydrate and 1.64g solid phosphorous acid powder according to the molar ratio of 1:1, pour them into a beaker, dissolve them with deionized water, add a magnetic stir bar to stir, and adjust the speed to 300 rpm After 15 minutes, add 12.5ml cyclohexylamine, cover with cling film and stir for 15 minutes to obtain a uniform emulsion. Among them, the volume ratio of cyclohexylamine to emulsion is 1:4.8; The emulsion was put into the reaction kettle, and then the reaction kettle was placed in an oven, and the oven temperature was set to 160°C and the reaction time was 2000 minutes. After the reaction is complete, take it out, wash and filter, dry the sample on the filter paper at 100°C for 3 hours, and obtain a sample with uniform particle size after grinding.

[0039] The test result of the emissivity of the sample in the mid- and far-infrared band of 2.5-25 μm is 0.928, and the reflectivity of the 0.2-2.5 μm ultraviolet-visible-near infrare...

Embodiment 3

[0042] Weigh 8.578g magnesium acetate tetrahydrate and 1.64g phosphorous solid powder according to the molar ratio of 2:1, pour them into a beaker, dissolve them with deionized water, add a magnetic stirrer to stir, and adjust the speed to 200 rpm After 20 minutes, add 10ml cyclohexylamine, cover with plastic wrap and stir for another 20 minutes to obtain a uniform emulsion. The volume ratio of cyclohexylamine to the emulsion is 1:6; the uniform emulsion The turbid liquid was put into the reaction kettle, and then the reaction kettle was placed in an oven, and the oven temperature was set to 180°C and the reaction time was 2000 minutes. After the reaction is complete, take it out, wash and filter, dry the sample on the filter paper at 110°C for 2 hours, and obtain a sample with uniform particle size after grinding.

[0043] The test result of the emissivity of the sample in the mid- and far-infrared band of 2.5-25 μm is 0.933, and the reflectivity of the 0.2-2.5 μm ultraviolet-vi...

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Abstract

The invention discloses a crystal material. The chemical formula is Mg11(HPO3)8(OH)6, the reflectivity in an ultraviolet-visible-near infrared band of 0.2-2.5 microns is 88% or above, and simultaneously the emissivity in a far infrared band of 2.5-25 microns is 0.90 or above. The invention also discloses a preparation method of the crystal material. The preparation method comprises the following steps: on the basis of raw materials of magnesium acetate tetrahydrate and phosphorous acid, simultaneously adding a cyclohexylamine template agent, and preparing the Mg11(HPO3)8(OH)6 crystal powder bya hydrothermal synthesis method. According to the crystal material provided by the invention, comprehensive performance of reflection and radiation can be well combined, the actual cooling effect is2-10 DEG C better than the common heat reflecting material titanium dioxide in the market, and the crystal material can be well applied to the field of heat reflection infrared radiation.

Description

Technical field [0001] The invention relates to a crystalline material, in particular to a material with high reflectivity of ultraviolet, visible, near infrared and high emissivity of mid-far infrared and a preparation method thereof. Background technique [0002] Global warming is a serious environmental problem that cannot be underestimated. There is no doubt that the increasing energy consumption that brings about huge greenhouse gases is the main reason. China’s energy use increased from 59 million tons of standard coal equivalent in 1980 to 2.92 billion tons in 2009. In 2011, building energy consumption accounted for 27.5% of total energy consumption, and this proportion will rise to 35% by 2020. Passive cooling or cooling without any power input may have a significant impact on global energy consumption. [0003] Passive cooling or cooling materials have high reflectivity in the ultraviolet-visible-near-infrared region of solar energy, and at the same time, they can pass ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/10C30B7/14
CPCC30B7/14C30B29/10
Inventor 张志杰徐志魁钟明峰吴文刚黄晓盈
Owner SOUTH CHINA UNIV OF TECH
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